High-pass filter for shortwave radios. The HF low-pass filter is designed to operate effectively in the 5-30 MHz range. Key benefits - Clearance of unwanted RF content in the 5-30 MHz band to improve signal quality for shortwave listening and reception. - Robust build that supports reliable current flow in RF circuits. Build and materials - PCB/board constructed with a 6 mm thick, double-sided plate and a copper weight of 57 g, providing solid electrical performance. Thermal performance - Large heat-dissipation area enables longer continuous operation without overheating, supporting stable performance during extended use. Power and compatibility - Designed for a 12 V input, delivering stable performance within a common power supply setup. Use scenarios - Home shortwave listening or amateur radio setups where stable operation and clean signal filtering in the 5-30 MHz range are desired. - Field testing or RF experimentation requiring reliable, heat-tolerant filtering during extended operation with a 12 V power source. - Laboratory or workshop RF projects that benefit from a compact, sturdy high-pass/low-pass filtering module with consistent performance.